Compilare: user.cpp: In function ‘int find(int)’: user.cpp:12:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=v[list].size();++i) ^ user.cpp:13:24: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if(v[list][i]=x) ^ user.cpp: In function ‘void del(int)’: user.cpp:21:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=v[list].size();++i) ^ user.cpp: In function ‘void insert(int)’: user.cpp:28:9: warning: unused variable ‘i’ [-Wunused-variable] int i,list=x%MOD; ^